src.org.python.expose.generate.NewExposer Maven / Gradle / Ivy
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Show all versions of jython Show documentation
Jython is an implementation of the high-level, dynamic, object-oriented
language Python written in 100% Pure Java, and seamlessly integrated with
the Java platform. It thus allows you to run Python on any Java platform.
package org.python.expose.generate;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import org.python.core.PyNewWrapper;
public class NewExposer extends Exposer {
private Type onType;
private String name;
public NewExposer(Type onType, int access, String methodName, String desc, String[] exceptions) {
super(PyNewWrapper.class, onType.getClassName() + "$exposed___new__");
this.onType = onType;
this.name = methodName;
if ((access & Opcodes.ACC_STATIC) == 0) {
throwInvalid("Full methods for @ExposedNew must be static");
}
if (!Type.getReturnType(desc).equals(PYOBJ)) {
throwInvalid("@ExposedNew methods must return PyObject");
}
if (exceptions != null && exceptions.length > 0) {
throwInvalid("@ExposedNew methods may not throw checked exceptions");
}
}
private void throwInvalid(String msg) {
throw new InvalidExposingException(msg + "[method=" + onType.getClassName() + "." + name
+ "]");
}
@Override
protected void generate() {
generateConstructor();
generateNewImpl();
}
private void generateConstructor() {
startConstructor();
mv.visitVarInsn(ALOAD, 0);
superConstructor();
endConstructor();
}
private void generateNewImpl() {
startMethod("new_impl", PYOBJ, BOOLEAN, PYTYPE, APYOBJ, ASTRING);
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ILOAD, 1);
mv.visitVarInsn(ALOAD, 2);
mv.visitVarInsn(ALOAD, 3);
mv.visitVarInsn(ALOAD, 4);
mv.visitMethodInsn(INVOKESTATIC, onType.getInternalName(), name, NEW_DESCRIPTOR, false);
endMethod(ARETURN);
}
public static final String NEW_DESCRIPTOR = Type.getMethodDescriptor(PYOBJ,
new Type[] {PYNEWWRAPPER, BOOLEAN, PYTYPE, APYOBJ, ASTRING});
}